package com.example.drools_springboot_demo.utils;

import org.springframework.stereotype.Component;
import org.springframework.beans.BeansException;
        import org.springframework.context.ApplicationContext;
        import org.springframework.context.ApplicationContextAware;
/**
 * 普通类调用Spring bean对象：
 * 说明：
 * 1、此类需要放到App.java同包或者子包下才能被扫描，否则失效。
 * @author Administrator
 */
@Component
public class MyApplicationContextAware implements ApplicationContextAware {
    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (MyApplicationContextAware.applicationContext == null) {
            MyApplicationContextAware.applicationContext = applicationContext;
        }
    }
    //获取applicationContext

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static<T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static<T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }
}